Adds manifest.json to examples folder (#3536)

* Revert "Revert "[examples] Add manifest.json""

This reverts commit c65336e63b.

* Revert "Revert "Do not use now-examples anymore""

This reverts commit ac72e944a7.

* Update nowignore

* Fix join

* Fix JSON

* Fix header

* Replace manifest.json with @now/frameworks

* Adjust readmes

* Adjust .nowignore

* Update scully

* Fix description

* Update examples/create-react-app/src/App.js

Co-Authored-By: Shu Ding <ds303077135@gmail.com>

* Update readme

* Add websites

* Use https

* Adjust example URL

* Change order

Co-authored-by: Shu Ding <ds303077135@gmail.com>

api/_lib/examples/example-list.ts

@@ -1,21 +1,25 @@
-// Currently we read & parse the README file from zeit/now-examples
-// TODO: create a `manifest.json` for zeit/now-examples
+import Frameworks, { Framework } from '../../../packages/frameworks';
 
-import fetch from 'node-fetch';
-
-/**
- * Fetch and parse the `Frameworks and Libraries` table
- * in the README file of zeit/now-examples
- */
-export async function getExampleList() {
-  const response = await fetch(
-    `https://raw.githubusercontent.com/zeit/now-examples/master/manifest.json`
-  );
-
-  if (response.status !== 200) {
-    console.log('manifest.json missing in zeit/now-examples');
-    return null;
-  }
-
-  return response.json();
+interface Example {
+  example: string;
+  path: string;
+  demo: string;
+  description: string;
+  tagline: string;
+  framework: string;
+}
+
+export async function getExampleList(): Promise<Example[]> {
+  return (Frameworks as Framework[])
+    .filter(f => f.demo)
+    .map(framework => {
+      return {
+        example: framework.name,
+        path: `/${framework.slug}`,
+        demo: framework.demo,
+        description: framework.description,
+        tagline: framework.tagline,
+        framework: framework.slug,
+      };
+    });
 }